G.2.1 Replacements with date argument %?[date] special texts

Apart from different representations of a weekday name, it is possible to create its weekday number. Likewise, the current day-of-year number, the day number, the week number, the month name, the month number, the year number, the Moon phase, the biorhythm, and some useful difference values can be produced.

For the date argument these %?[date] special text may have, the following rules concerning definite omission values are valid, elucidated by using the yyyy[mm[dd|wwwn]] date format⁸²:

• If yyyy… is not given (≡no date encoded), the current year is assumed for the date.
• If yyyy is set to 0000, the current year is assumed for the year.
• If mm is not given or set to 00, the current month is assumed for the month, and the December is assumed in case mm is set to 99.
• If dd|www is not given or set to 00, the current day is assumed for the day, and the last day of the month is assumed in case dd is set to 99.
• If the n field is given (range 1…5 or 9), then a www field must also be specified.